Process for making containers



Dec. 30, 1947. G, BARDIN 2,433,806

PROCESS FOR MAKING CONTAINERS Filed Feb. '5, 1938 mymlll Patented Dec. 30, 1947 T OFFICE rnocnss FOR MAKING CONTAINERS Georges Bardin, Tournus, Saone-et-Loire, France Application February 5, 1938, Serial In France March 10, 1937 Section 3, Public Law 690, August 8, 1946 Patent expires March 10, 1957 1 Claim. (or, 113-120) The present invention relates to a process for constructing thin-walled hollow bodies by stamping.

Containers are known which consist of a stiff and of a flexible cap, the latter of which is pressed inwards into the former for emptying the contents. The manufacture of such containers according to the known processes is difficult and costly. If the cap is manufacture from a thin sheet of aluminum or the like by stamping, folds or cracks are formed in the sheet, the distribution of the thickness is irregular, the container is porous and leaky, the cap has to be provided with a coating, whereby the cost of manufacture is increased.

On the other hand, it is necessary in the known processes, to lubricate both faces of the sheet 1 punch 8, a correct before stamping, so that after stamping it is necessary to clean the inner wall of the cap; this is particularly diilicult'and costly forthe flexible inner wall.

The process according to the invention, which eliminates these drawbacks, consists in stamp ing the thin cap of the'container simultaneously with the stiffer cap; a nozzle or nozzle support may be provided beforehand in the rigid sheet.

Owing to this simultaneous stamping, on the i one hand the resistance to stamping is increased and on the other hand the friction between the stamping tool and the thin sheet to be stamped is eliminated on one side, whereby excessive stresses on the thin sheet are prevented and a flawless fluid-tight container wall'is produced.

In the accompanying drawing examples of embodiments of the object of the invention are shown. In said drawing:

Fig. 1 is a diagrammatical view of a container in section; V

Fig. 2 shows a container manufactured accord- "ing to the present process, before filling;

,jg. 3 is a diagrammatical view of an apparatus}, for carrying out the present invention;

Fig.4 shows an embodiment of the device for manufacturing a container according-to Fig.1. 1

According to Fig. 3, thethin metal'sheet to is placed on the tool, beshaped resting on the die I and. thespunch 8 which is guided by the parts 8% the metal sheet 5 to be shaped. Owing :to the the process according to acting on the protecting plate 5 which is in general thicker'than subsequent cleaning is by the die IS in the stamping stress over the entire surface of the sheet 5 and eliminates the friction of the shape of the hollow body is obtained. The container wall thus manufactured has neither perforations, cracks, porosities nor leaks.

The protecting plate 6 which serves as a lining can be made of any appropriate material and have any appropriate thickness, it may for example be made of the same metal as the sheet to be shaped, any device being used which facilitates the subsequent removal of the protecting plate 6.

If elements are shaped which are to form the same assembly, according to the present process the two sheets are shaped simultaneously. If for example a container is to be manufactured which, as shown in Fig. 1, consists of a stiff half-container provided with a nozzle support 2 and of which the periphery is fixed by fluidtight crimping to the periphery of a flexible cap, the simultaneous stamping of the'elem'ents I and 4 is eifected in the manner shown in Fig.4.

The stiffer plate 9 from which the cap l is formed and in which the depression Ill serving as a nozzle support has already been provided, is placed on the die II in the presence of an intermediate die It which is supported by a spring 13 in order to prevent the deformation of the nozzle during the stamping operation, then the plate 9 is laid on a thin metal sheet l4 and the whole arrangement is subjected to the guided by the parts ll. In this manner, when the stamping is come of the stiff cap has been periphery 4 of the flexible cap conjunction with the die H, the container shown in Fig.- 2 is obtained. The stamping is effected without any lubrication of the contacting faces of the sheet, whereby a eliminated.

crimpedon the v The container takes up its finalshape shown in Fig.1 during the be stamped 5 together with aprotecting plate ii-v for example the sheet 5 to use of the protecting plate 6 which acts as a damper, and procures a uniform distribution of filling under pressure with the contents to be stored in the container.

Containers of any desired shape can be manufactured according to the process described. The wall of the hollowbodies can be provided with a lining ora protecting. covering made of non-corrodible metal for of precious metal as an ornamentation, by simultaneously stamping a thin sheet of non-corrodible or'precious metal.

The process can also beused for manufacturing containers of all kinds, in

y stamping.

particular for shaping What I claim as new and desire to secure by Letters Patent, is:

A process for manufacturing containers consisting in placing a relatively flexible flat metal sheet in face to face contact with the flat portions of a relatively rigid flat metal sheet having a nozzle performed thereon, simultaneously dieshaping the contacting flat portions of the two sheets in one shaping operation to produce from 7 each sheet a dome-shaped structure, the two dome-shaped structures being in face to face contact in their simultaneously shaped portions, and joining the edges of the two contacting domeshaped structures, at least a part of the central portions of the flexible structure being adapted 15 to be separated from the relatively rigid structure to form a container.

GEORGES BARDIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Number Name Date Cole Jan. 30, 1894 Kuen Feb. 18, 1919 Harrison Feb. 3, 1920 Geake Mar. 2, 1926 FOREIGN PATENTS Country Date Great Britain June 1, 1922 

